Income After Tax-5 Year Interim Trend Volatility

This is an Interim Trend Volatility of Income After Tax over 5 years. Trend Volatility is derived by subtract the log linear Estimated index value (in index value units) from the Actual index value and divide by the Estimated index value to derive a % deviation. Repeat this for each observation and average the .absolute. results to derive a % Mean Absolute Deviation. Express this result as a percentage. Required 11 latest semi-annual or 21 latest quarterly periods. Income After Tax represents the sum of Income Tax (Total) and Income Before Tax for the same period.